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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025f23e16d145a076878e53998afbaf017681aa7b4037688aca324ca9259100a' 
  AND token = 'sJorHwszj9Agz8wHAoTGUE+2BfiM8H7s1eyhd8M7Aqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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