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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268a95e3ad4ce9a7839a6b89f05f53ff7f8c3192603171d4051972062f8d6379' 
  AND token = 'Lk/InRdIqIFM37vcS8A5DRyZj8bbnsw/R/EsOO7QEgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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