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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17837887e77bd21a05347ada43f9cbf1935c6f908b50ae4b13755e6d2a63db0c' 
  AND token = '5Tja76gRL2B5qJMFWXd7cJgN9STPTX/Shg42jp08zl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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