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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524a1cd8ec0096e5e69240e6290de735bb5263564dc10285115341335667b060' 
  AND token = '96xSjmS2zJKHEHtGEk/tWqUOa1GXPfAYuxPmjTS/Pv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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