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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c925838df0d9d10f6ab8726079c4b027d78fbc4a0e6f44a4eb4ab0d82ae980' 
  AND token = 'fek8cSx4hcBOKXtzwGsSFbreXdkB1oNmbRwArYAn2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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