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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884c2bc81fb3a209730d352f6025da7e68fcaf270b50a5034e329bb07926f1ef' 
  AND token = 'RzZ3aOS8E8y6nkn7h2aXpbI5G4ckO8StTS2qP+HP2f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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