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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b54d20b06a423c698217d939cc6c9907891202c6134e86bdf8e2b434850b6f' 
  AND token = 'n6S2Xolp19BZ5bOpCKQlLv3cicTXgWldyEl7w/YS9Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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