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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dc4cbabd0d68d7628681ebe956b2343350b0a7cb0ee10431780d1ce2b7d9ba' 
  AND token = 'mcXTu99j8bgoOKPeVamHtOx/5msu415Vlbi2Gj2/OQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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