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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bead1e6bef14046fac4401664a8ddcf559fc2dd43a55ef693a24229d6bb53d2' 
  AND token = 'jfXkD/RZceiGQvot/8igJ58/NgMw6sT0bkiDYbrvOFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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