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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7d6c79ee300ae897ca728b879e91d0411951b14528936ba969a7ba8561182d' 
  AND token = 'v1LCCxPHSKqsJ79E+MXiXrkiR6l5/yVs2hn4bCkhal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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