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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9c591456b3da2f9343685f968dcae6ed86a1db75c2409e1573fa90c2efb867' 
  AND token = 'XqM0osIyyu3HexdzueMuNYyCeBEHut7V2zBtPJqsn5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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