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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d65605eebdffce26ff61814e24a7c586fd41abaa2ce4dcd059d3e177e3e762' 
  AND token = '87XJKglHrOms4GkeYsjkmaq3XRMlEPT/KD4xySC1RFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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