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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abad2de1e8e223a51d02a6454b6e672bed17328ee1bb38f212a80be95ffedd2e' 
  AND token = 'S2zFmATA25xgSj5+4UyHtGmdxm5HJXIMR2XZKeEo4Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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