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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1054e219fc95e0477895d965469545fd27e89419992a0211ceabbff9ab9ec34' 
  AND token = 'B/ljalZ9i2sy8dwY+4ZLUazO/M3X7Tac2S7QU7jxhLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}