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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8848644b6dbdc1bfd0d5f29f5d8b7d0d3484d7e384ff6e47a21cd50f984ff0d1' 
  AND token = 't2OWCulKAwL1Dffysemb1ib4vwvTeuJvszDsJa88MVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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