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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2de904ee0731b514db9dc7c35abac8388c06fd64e252d346659fba29fed95dc' 
  AND token = 'uglCKMGsyI2vh8LEC8pMWSsdDOvVJlvIuU4U1Ks4Mdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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