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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbedc1f687c2f9b9147a7a45b8dc493e4d5ed1c894cf48be5ffc168e4b7ff5d' 
  AND token = 'Ee43PugN68ENvmcQitMZMgW1+ororDROycqy2fxGUAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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