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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b2e8b0cf3f1326df228daba6f2ab8df16a95a8db418e5dc1fee37c7d866224' 
  AND token = 'fchr3rg5OFPLC/ByjDTQpgBo7DUotAlqlbQ5KHuHxbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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