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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55969f2d910f6bb4311809bb8ad1e8abb0f2851743c124e0557af17d62d97215' 
  AND token = '4vxaNuF6JGqHMGJqcM0Tq4R/cOUekeLA0zop7gb/2S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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