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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27371bf6c009840ca92a444c5d90f0d41fc93ba137abb648ee62ad38d480d96a' 
  AND token = 'A2MgxPVK+woXiN3C1/oPWSp+X0tHUcN2lvhoUaH++Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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