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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe97e371c5eac7c89b591d20b9809ab5d8d2602f87c5141a5e33c4f428cea02' 
  AND token = 'bSfZuQWDt0I9vF44QAhVilR56L/snD6ShHP1GxxxW10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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