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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ade7d08a6df6ce80a009c7438d26832f22f284b0399619b4ed517b6db6d67d4' 
  AND token = '1o12fImj7Wiywb7eOBSXrWTmPkrmXrlXZ+MAs1D3LHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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