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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d7bacfc85ee4a6bde6582e444d9e0618a87ff986a944088ae04b6f3e64d8ff' 
  AND token = 'c969eF2VZ6nEWaeGa1lMbhnEwVtH136+FK/Nwa/gf/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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