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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbfa7cdf08d83ce6e4c42272ac56bd8788f85ad893ec158d2d00e5c8b666d78' 
  AND token = 'YgeAGBo0FdMRO4WRU/lDb8lFXVeQQk+WGE68QwFXUds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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