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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07297a80755d5f326686d2535c6f4b75a10e10fa4e8a2d31067fe9787b018d6f' 
  AND token = 'Yy7yi20rEPCTzXrtoAFgcIOXtQ2mAESoB7na7Tpfy5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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