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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3134c4c17a45d4bd8fef5571400f4f0cff6f1711081ad34d646d91f30f9e3f83' 
  AND token = 'YJf0yUAoj/Cl+zeu2p4YAD85J9S8wn2aeOoSNO6F36g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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