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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2b7d9eeb2f65adcfaab9911d7fdd35efdb8e4e2f9b580a9fe198ff24c659f1' 
  AND token = '7NbnWq5uSgpXemW1hF8z3w+76SJKkTGm46hZvbc7uag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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