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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c708a746484648175129919b154dafd925bd4d4287d7f2d4450913c56cbb4974' 
  AND token = '3t7vIbbuN1yBZAXGMthmhSjHJxdfDyjtxgHOoV/dptM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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