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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d6add1690a55c8204c8a7f193fbe3830e1cfb6e48d8cd782ea53dedcbb0fb5' 
  AND token = 'g47OvttFU6EMdB7gkPumol7Cv82ITUcoIVebbZoSid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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