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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacca63db0819f638e390f0336ba710a451710ffd2bd42803e78d16d50c9b966' 
  AND token = 'B6fzUhhJNlnH3irM+fTh67gKRVgJFbUl+029tMZTAt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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