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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6339c69cf51dd7ddd9cad1c4e93f13a6e5fc362e57c32eb02e8b48ae86b9b626' 
  AND token = 'At11rcinNMcPTfr0cOU1xm+q2+Co4VniSueASQlyfCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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