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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ff1e683b8b779706f7b14d2e848f1787463cf834c82b6c80510338d899b4ce' 
  AND token = 'SmZKta0PPXcD622ot7Sjug9n17nyz15pR28CCRjAXug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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