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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c234e1be786ba66fa6136308dcb6732dc951e7771edf2a06b5e1620b77b64d' 
  AND token = 'gcoZNDpmEI1o+fDegfIO9iocA9scaOI+HUVhFRNI5ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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