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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954ee274150115641c88578f27868aa23129d18917a57b54dccb8504ac5c2999' 
  AND token = 'Nb0T7mIWDV107jLgA6QDsvzxQ9GDllw4GcRcBbQ5Ym0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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