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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93952951e442a870eb1b2ea97d23481b0808f7e38b1df56dc14d377a2089006f' 
  AND token = 'eNPP3K05bGE1cF5GvnVOBoSgcMg/deaQg21EVRAqhs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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