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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66790d00f0051ce665724c4db49b05f43d5d60cd00ca8a0385d90a570fedd25e' 
  AND token = 'UbRy4uR88i84v0DVedUe4YpjYPuyqVtmfXm1ZNywbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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