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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bc14c4bcda397aaaedb7886be7fac31c1aea2e5f9f1c2f572edbc50cbe0e28' 
  AND token = 'Mar5Cy/1YJcjkSC9h9L+B82XIo2s+wl9BugmLB6vo6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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