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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219ae086b2be801de0c56a16b1218126177c2a6061f46d00001a1340fce6083b' 
  AND token = '/TxwiuWhakO+wFNSi4QG5s1Hb3H891qD0BfEZUQxFn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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