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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1005c4e6d586e8d925640792148cc56c0408b64e7450d63ed956e8c3f026c6b0' 
  AND token = 'HHSpE9iF+zyU/HY7sRnGpkfooyjZ7bdYrfH+208Zj/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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