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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc11edf0aa5744e74d159725403a75987c1f47a46cd8dab060eccbb7354d5a93' 
  AND token = '8vdZCVxmm2tkdkV9Gk1QW3SJ7G7ya2WZUGTSC23VOzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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