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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29008a8cef1cc17435d2d63fa308dc84decd43a90ec2d316df9ea9647f1293ea' 
  AND token = 'FiNl5ZzzEQ7ceW5OKg7sJn6WNfyDKzjVXjoDA64tpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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