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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5163c0f495cab53f4ffaa854e71f8af7bb5fbfeafb9ad6e85b6e28e0a13e077c' 
  AND token = 'mHMpc1zUSOZEunsXBnNBxlFYKN96IK7d5ZeSHiQ8MT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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