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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47a37dd229b2ed24f273b1ba729b61ba9ee7ab55f8fb30949e9e39a79e1441b' 
  AND token = 'PeTE9OW3OrcCnlpGipF3PqqAV0Ymm6bEMSuvo/pdg4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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