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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b32255047ee127f527c99c874951a5794aa665361208fc8b761d79eda4c3fa' 
  AND token = '4DmZ2xVMkfuRwxkpnvdMqXHvnrHMHWEY+19Cr6idBjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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