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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717c723053d5cd45f754200faf58968fc391d8c67d691cf98f93bd5a5724d678' 
  AND token = 'BLyeDXBcAZPw1Z7kqSk1eYyzshW8oZ0QuLK9lYdaWHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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