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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e59d450855bd3873829ab85d548d338439e408ba723155756bb9b07ac08430' 
  AND token = 'F1ELtpcARIIF0SIrYZXl6l9/cArXV6ZqjWwC1YRV7nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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