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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9896b5315891435f32cede99392b85f98d2a0fd9e957354bf3d447a0283ea2' 
  AND token = 'pbwMD/sZle/+91DwgNK/1nAT4Cydbv9Xl3zEQWi+JI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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