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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc16eb3f238822d0db7c12313382458f3d112f06614befe0f5746dfbbe9dc8' 
  AND token = 'bOBvnB/jjePuwtHz1XymREeTAwgIGIZuxophimzQ6PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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