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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2da2830e979b3823f712ff87e090008aab9796cdf1a9e910527209b9ccc7d7' 
  AND token = 'TfyHfAi2nO74X7dAxHWLI2XFdb76X4fMobX0b38FCm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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