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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b9cdeb37b5a66fd401e2b2f91191ed3a0b53a48dea25b35abc6e502fe22f70' 
  AND token = 'MfnGCjQf6J4j3vFNmpyXkrHz1eAhCnMFieNyr/VL1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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