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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adffac207a80cfb982f6ee608d6bf259a7102fcf07eec159d846362c05810c4c' 
  AND token = 'WWWQUvFzcRrp/Z9kk/2LwpvIXjqTz1hzGgsCZXceEaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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