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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96abf72e157f5bc5094492818ce67c7d28eed1e32e8e37826014b88f9fd79cb' 
  AND token = 'yzfp24mRtYJW8jXf9QMlO4UlhDBXxN2c1rBArPy1lR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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