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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f04a0c4113cf2fd799a853815ffa86ef959ab6c9e66fa563626e2daec3562b' 
  AND token = 'y7LGPn0sSsrmrjUEr8ggy1JlxwP5EeFXW4s/dldHtSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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