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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653fd855ea9d8fbf1667b22117423db6d302517762d23dfaee6bb5fee1bb9af2' 
  AND token = 'wrxnXgwhPyK7nQHM4deQACH5M6YAQdFjXXYRno4Drxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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